CN109273120B - Compact type small nuclear reactor cold section temperature measuring method - Google Patents
Compact type small nuclear reactor cold section temperature measuring method Download PDFInfo
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- CN109273120B CN109273120B CN201810897974.2A CN201810897974A CN109273120B CN 109273120 B CN109273120 B CN 109273120B CN 201810897974 A CN201810897974 A CN 201810897974A CN 109273120 B CN109273120 B CN 109273120B
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- temperature
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/112—Measuring temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention provides a method for measuring the temperature of a cold section of a compact small nuclear reactor, which comprises the following steps: step 1, before assembling a sealed nuclear reactor, installing a temperature measuring probe at the bottommost part of an integrated measuring assembly; step 2, embedding a data transmission lead of the temperature measuring probe in a measuring channel of the integrated measuring assembly; step 3, inserting the integrated measuring assembly into the nuclear reactor from top to bottom, and fully contacting the temperature measuring probe with the bottom coolant; step 4, repeating the steps 1-3, sequentially installing temperature measuring probes on other integrated measuring assemblies and inserting the temperature measuring probes into the nuclear reactor; and 5, taking the average value of all temperature data as the temperature value of the cold section of the nuclear reactor during operation. The method cancels bypass measuring pipelines, nuclear first-level valves, instruments and other equipment, simplifies the device, improves the reliability of the pressure vessel, reduces the cost, does not need to worry about the leakage problem of the coolant in the operation period, and avoids the occurrence of large break loss of water (LOCA) accidents.
Description
Technical Field
The invention relates to the technical field of nuclear reactor internal monitoring, in particular to a compact small nuclear reactor cold section temperature measuring method.
Background
At present, temperature measurement signals of a cold section in a nuclear reactor coolant system in a nuclear power station need to be sent into a reactor control and protection system, direct-insertion measurement is mainly adopted for a large-scale distributed pressurized water reactor (such as EPR) reactor in the nuclear power station, namely, a temperature measurement thermal resistor is directly inserted into the cold section, the measured coolant temperature can fully represent the cold section temperature due to the fact that the coolant in the cold section is fully stirred by a main pump, the measurement precision can meet certain requirements, and signals are accurate and reliable. Aiming at the cooling system of some compact small-sized piles, main equipment is not connected through a main pipeline, an inner sleeve and outer sleeve structure is adopted to connect a main pump and a pressure container, an outlet of the main pump is connected with an inner sleeve, and a nozzle between the main pump and the pressure container is in butt welding to form an outer sleeve. The inner sleeve and the outer sleeve can enable the reactor coolant system to be arranged compactly enough, but the structure eliminates a pipeline of a cold section, the temperature of the cold section cannot be measured by a method of directly inserting the cold section, only a bypass pipeline is led out from a descending section annular cavity of the pressure vessel, a temperature measuring thermal resistor is arranged on the bypass pipeline, and the led-out bypass pipeline can be returned to the reactor coolant system from a low-pressure position under a pressure head of a main pump, as shown in a lower cold section bypass temperature measuring schematic diagram of fig. 2. Other modes must be considered for the cold section temperature measurement of the small-sized pile, namely, limited space is fully utilized, and the measured temperature is reliable.
Disclosure of Invention
The invention aims to provide a method for measuring the cold section temperature of a compact small nuclear reactor, and solves the problem that the small reactor cannot accurately measure the cold section temperature.
In order to solve the above technical problems, the present invention provides a method for measuring a cold leg temperature of a compact small nuclear reactor, which uses an integrated measurement module in the nuclear reactor as a carrier for mounting a temperature measurement probe, and comprises:
step S1, before the nuclear reactor is assembled and sealed, the temperature measuring probe is arranged at the bottommost part of the integrated measuring assembly which needs to be inserted into the nuclear reactor;
s2, arranging a data transmission lead of the temperature measuring probe in a measuring channel of the integrated measuring component;
s3, inserting the integrated measuring assembly provided with the temperature measuring probe into the nuclear reactor from top to bottom, wherein the temperature measuring probe finally penetrates through a lower supporting plate of the nuclear reactor core, reaches the bottom in the nuclear reactor and is fully contacted with a bottom coolant;
step S4, sequentially installing the temperature measuring probes on other integrated measuring components in the nuclear reactor according to the method of the steps 1 to 3 and inserting the temperature measuring probes into the nuclear reactor;
and S5, when the nuclear reactor is operated, transmitting the temperature data monitored by each temperature probe in real time to a monitoring system, and taking the average value of all the temperature data as the temperature value of the cold section of the nuclear reactor.
In an alternative embodiment, the integrated measurement assembly is mounted within a pressure vessel of the nuclear reactor.
In alternative embodiments, there are four sets of integrated measurement assemblies within the pressure vessel.
In an alternative embodiment, an instrumentation guide tube seat for protecting the integrated measurement assembly is correspondingly mounted on the lower support plate.
In an alternative embodiment, the side wall of the meter conduit seat is provided with an opening.
In an optional embodiment, the average value of the temperature data detected by the four groups of temperature measuring probes is used as a reference, so that an operator can monitor the working condition of the cold section conveniently.
In an optional embodiment, when any one of the four sets of temperature data has an abnormal deviation, it is determined that the temperature measuring probe in the set has a fault and needs to be replaced.
In an optional embodiment, the temperature measuring probe is replaced only by taking the corresponding integrated measuring assembly out of the pressure container and replacing the temperature measuring probe with a new one.
In summary, the embodiments of the present invention have the following advantages: according to the method for measuring the temperature of the cold section of the compact small nuclear reactor, on one hand, devices such as a measuring pipeline, a valve and an instrument of a bypass are eliminated, the device is simplified, and the reliability of a pressure container is improved; on one hand, the pressure container can be provided with a nuclear first-level valve, so that the cost is greatly saved; on one hand, the leakage problem of the coolant in the operation period is not needed to be worried, the occurrence of large break loss of water (LOCA) accidents is avoided, and the safety of the unit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a method for measuring the cold leg temperature of a compact small nuclear reactor according to the present invention.
FIG. 2 is a schematic diagram of the bypass temperature measurement principle of the cold leg of a compact small nuclear reactor.
FIG. 3 is a schematic diagram showing the installation position of a temperature measuring probe in an embodiment of the method for measuring the cold section temperature of the compact small nuclear reactor according to the invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
The embodiment of the invention provides a method for measuring the temperature of a cold section of a compact small nuclear reactor, which can use an integrated measuring assembly in the nuclear reactor as a carrier for installing a temperature measuring probe, wherein the specific working flow chart is shown in figure 1 and is combined with the installation position sketch of figure 3, and the flow comprises the following steps:
step S1, before assembling the sealed compact type small nuclear reactor, installing a temperature measuring probe 12 at the bottommost part of the integrated measuring component 11;
step S2, arranging the data transmission lead of the temperature probe 12 in the measurement channel of the integrated measurement component 11;
step S3, inserting the integrated measuring assembly 11 provided with the temperature measuring probe 12 into the nuclear reactor pressure vessel 1 from top to bottom, wherein the temperature measuring probe 12 penetrates through a lower support plate 13 of the nuclear reactor core, reaches the bottom in the nuclear reactor and is fully contacted with a coolant 9 at the bottom;
step S4, installing other integrated measuring components in sequence with a temperature measuring probe and inserting the temperature measuring probe into the nuclear reactor according to the method of the steps S1-S3;
and step S5, when the nuclear reactor is operated, transmitting the temperature data monitored by each temperature probe in real time to a monitoring system, and taking the average value of all the temperature data as the temperature value of the cold section of the nuclear reactor.
Further, because of the need to improve the accuracy of measurement and to protect the probe from damage, there is an instrument conduit seat (not labeled) on the bottom support plate 13 that must be correspondingly configured to protect the integrated measurement assembly 11, and holes are formed on the periphery of the instrument conduit seat to ensure that the temperature probe 12 can be fully contacted with the coolant 9 at the bottom when reaching the bottom of the pressure vessel 1 and being placed in the instrument conduit seat. Of course, if the temperature measuring probe 11 fails and needs to be replaced, the corresponding integrated measuring assembly 11 is taken out of the pressure vessel 1 and replaced with a new temperature measuring probe.
By way of example, four sets of integrated measurement assemblies 11 need to be installed in the small nuclear reactor 1 in the present embodiment, and temperature probes 12 are installed at the bottoms of the four sets of integrated measurement assemblies 11. Because the installation position and the detection position of each group of integrated measurement components are different, in order to distinguish the temperature data measured by each group of probes when the reactor runs, the integrated measurement components are respectively marked as a temperature measurement probe a, a temperature measurement probe b, a temperature measurement probe c and a temperature measurement probe d, and the corresponding temperature data are respectively marked as Ta, Tb, Tc and Td. During reactor operation, the measured value of the cold leg temperature may be equal to
T=(Ta+Tb+Tc+Td)/4 (1)
This average value T of the temperature can be used as a reference value for the operator to monitor the working conditions of the cold leg. In the actual monitoring process, the real-time data of Ta, Tb, Tc, and Td should have a small deviation, and if the data deviation measured by a certain temperature measuring probe is too large, it is very likely that the temperature measuring probe has a fault and needs to be replaced.
As can be seen from the above description, the present invention has the following advantageous effects: according to the method for measuring the temperature of the cold section of the compact small nuclear reactor, on one hand, devices such as a measuring pipeline, a valve and an instrument of a bypass are eliminated, the device is simplified, and the reliability of a pressure container is improved; on one hand, the pressure container can be provided with a nuclear first-level valve, so that the cost is greatly saved; on one hand, the leakage problem of the coolant in the operation period is not needed to be worried, the occurrence of large break loss of water (LOCA) accidents is avoided, and the safety of the unit is improved.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (6)
1. A method for measuring the temperature of a cold section of a compact small nuclear reactor by using an integrated measuring assembly in the nuclear reactor as a carrier for mounting a temperature measuring probe is characterized by comprising the following steps of:
step 1, before assembling and sealing the nuclear reactor, installing the temperature measuring probe at the bottommost part of the integrated measuring component needing to be inserted into the nuclear reactor;
step 2, arranging a data transmission lead of the temperature measuring probe in a measuring channel of the integrated measuring component;
step 3, inserting the integrated measuring assembly provided with the temperature measuring probe into the nuclear reactor from top to bottom, wherein the temperature measuring probe finally penetrates through a lower supporting plate of the nuclear reactor core to reach the bottom in the nuclear reactor and is fully contacted with a bottom coolant;
step 4, sequentially installing the temperature measuring probes on other integrated measuring components in the nuclear reactor according to the method of the steps 1 to 3 and inserting the temperature measuring probes into the nuclear reactor;
step 5, when the nuclear reactor is operated, transmitting temperature data monitored by each temperature measuring probe in real time to a monitoring system, and taking the average value of all the temperature data as the temperature value of the cold section of the nuclear reactor;
the lower supporting plate is correspondingly provided with an instrument guide pipe seat used for protecting the integrated measuring assembly, and the side wall of the instrument guide pipe seat is provided with a hole.
2. The method of claim 1 wherein the integrated measurement assembly is installed in a pressure vessel of the nuclear reactor.
3. The compact small nuclear reactor cold leg temperature measurement method of claim 2, wherein the integrated measurement assemblies in the pressure vessel are in four groups.
4. The method of claim 3, wherein the average of the temperature data detected by the four sets of temperature probes is used as a reference for an operator to monitor the working condition of the cold section.
5. The method of claim 4, wherein when any one of the four sets of temperature data has an abnormal deviation, the temperature probe in the set is considered to be replaced when the temperature probe in the set fails.
6. The method of claim 5, wherein the temperature probes are replaced by removing the corresponding integrated measurement assembly from the pressure vessel and replacing the temperature probes with new ones.
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| CN110375884A (en) * | 2019-07-31 | 2019-10-25 | 广州粤能电力科技开发有限公司 | Electrical equipment temperature monitors system |
| CN113405686B (en) * | 2021-05-19 | 2022-07-01 | 中国原子能科学研究院 | Temperature measuring method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103208317A (en) * | 2012-01-17 | 2013-07-17 | 巴布科克和威尔科克斯核能股份有限公司 | Integral pressurized water reactor with external steam drum |
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| EP0204212B1 (en) * | 1985-06-04 | 1991-01-16 | Westinghouse Electric Corporation | On-line monitoring and analysis of reactor vessel integrity |
| CN105513657A (en) * | 2015-12-14 | 2016-04-20 | 中广核工程有限公司 | Nuclear power plant integrated in-core instrumentation assembly |
| CN106683717B (en) * | 2017-01-20 | 2019-03-01 | 中广核研究院有限公司 | Compact pressurized water reactor |
| CN207503653U (en) * | 2017-10-27 | 2018-06-15 | 中广核研究院有限公司 | Nuclear reactor primary Ioops system and its voltage-stablizer spray system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103208317A (en) * | 2012-01-17 | 2013-07-17 | 巴布科克和威尔科克斯核能股份有限公司 | Integral pressurized water reactor with external steam drum |
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